Peters



(No Model.)

B. SMITH.

PAPER MAKING MAGHINE.

No. 350,607. Patented .Oct. 12, 1886.

N PETERS. Pnmo-Lima m hu, Wmin wn. D. C.

NITED STATES PATENT OFFICE.

RICHARD SMITH, or SHERBROOKE, QUEBEC, CANADA.

PAPER -MAKING MACHINE.

SPECIFICATION forming part of Letters Patent No. 350,607, dated October 12, 1886.

Application lilerl January 15, 1886. Serial No. 188,645. (No model.)

To all whom it may concern.-

Be it known that I, RICHARD SMITH, a citizen ofthe Dominion of Canada, residing at Sherform a part of this specification.

This invention relates to paper making machines, particularly that portion through which the continuously-traveling endless paper web is passed and dried.

My invention relates especially to a method by which a current or series of currents, opposed or otherwise, of cool air are passed from either or both sides of the driers, so called, transversely of the path of travelof the paper web, such current or currents to emerge upon the paper web at a point or series of points where the condition of dryness of such web will permit of the application thereto of said currents of air.

To persons conversant with the calendering of paper it is a well-understood fact that paper in a cool and somewhat moist condition will assume a very much higher polish and smoother surface than the same material when thoroughly dry, since in the latter state it is hard, while when'slightly moist it is much softer and the irregularities upon its surface will yield the more readily to the pressure of the rolls; hence it is extremely desirable to be able to pass the paper web through the rolls in a cool but slight-1y moist condition, which should be maintained permanent, or as nearly so as is possible. Thus the condition of the continuously-traveling paper web must be neither too moist nor too dry, since in the former case the material would be blackened by Contact with the calender-rolls, and it would be thereby rendered worthless for commercial purposes, while in the latter case, or when too dry, the paper would not be materially injured; but almost as serious an objection would occurthat is, it could not be properly calendered,.and it would present a rough,unfinished appearance. Moreover, my method of passing the paper web through an uninterrupted current of cool air prior to its entrance between and through the calenderrolls presents severaladvantageous features, prominent among which would be the efficacious result of increasing the circulationin the machine room, thereby benefiting the health of the operatives; secondly, in the re moral and annoyance attendant upon the steam and excessive moisture which arise from the continuouslytraveling paper web then in process of drying; and, thirdly, in the removal, by the currents of air passing transversely of the path of travel of the web, of all foreign substances which may be adhering to thesurface thereof,such as dirt or grit. The removal of all such foreign substances before the paperweb enters the calender-rolls is of great importance, since it not only prevents such matter from being pressed into the paper, but it maintains the surface of the calenders in better condition and prevents undue wear and cutting thereof.

The drawings accompanying this specification represent, in Figure 1, a plan, and in Fig.

2 a side elevation, ofa series of driers provided with an apparatus to carry out my system and method of cooling a continuously-travelrear air supply pipe is represented to more clearly show the system. In these drawings, A represents the standards, and B B B a series of driers belonging to and forming part of a paper-making machine, the wet part of which is not shown. These driers are mounted and operated in the manner now generally adopted for apparatus of this class, and are supposed to be rotating in the direction as shown by the arrows. In connection with said driers is employed a continuously-traveling endless canvas apron, D, or drier-felt, so called. Thisfeltis actuated by the driers, and is supported upon the rolls a a a, which are disposed .transversely of the machine. Said drier-felt is employed to support and conduct the paper web in. its passage through the driers, and thence the web passes to and is guided through the calender-stack, which is represented at O.

The apparatus whereby my system is effected ing endless paper web. In Fig. 2.0nly the ICO and accomplished for cooling the paper web,

and which will have a tendency to prevent it from becoming overheated and dried, consists, primarily, of two supp] y-pipes, b 1), arranged lon gitudinally of the inachincframe, 011 the front and back sides thereof, and about on a level with the paper web when traveling horizontally during its progress from one drier to another. United with said pipe, and extending inward with respect to the machine, are disposed a series of branch or discharge pipes, c 0, adapted to deliver a continuous supply of cool air upon both sides of the paper web. Such air is supplied by a blower, 16, arranged beneath the machine-room; or, it preferable, this blower may be placed in any other suitable position from whenceacontinuous supply of cool air may be obtained at any or all times.

I do not confine myself to any precise number ot discharge-pipes, nor to their position, since they may be arranged at any desired place where the condition of the paper web then in process of drying will permit of such application.

Since the air is delivered on opposite sides of the machine,t-here will be opposing currents, and it is evident that the air passing over the upper surface of the then passing paper web will be diverted upward, and thus rapidly carry off the steam, remove the moisture, and generally condueeto abettercireulation of and improvement in the quality of the air within the machine'room. Moreover, the air passing round and about the driers will rapidly cool the paper web, and the latter will finally pass in a eomparalivelyeool condition to the calenders. Such cooling of the paper web will permit it to retain asufficientamount of moisture to admit it receiving or assuming a hi ghlypolished surface from its contact with the calender rolls during its passage therethrough.

The months or discharge ends of the pipes c- 0 are preferably trumpet or funnel shaped, that the air may be distributed over alarge area, in lieu of impinging upon thepaper webin a direct line transversely ot'its path of travel.

I claim- The method, substantially as herein described, of-cooling a continuously-trayeling endless papcrweb during its passage around the driers and prior to its passage between the calender-rolls, which consists in delivering a series of cool air currents C0llllllllOllSly but transversely of the path of travel of the paper web, substantially as and for the purposes herein set forth and explained.

In testimony whereof I. affix my signature in presence of two witnesses.

RICHARD SMITH.

Witnesses:

H. E. Lonen, F, CURTIS. 

